package jsyf.oa.service.wechat.service_company;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Created by jjx on 2018/3/31.
 */
public class ContactsPOST {
    /**
     * 描述:  POST请求提交文件到URL--微信上传临时素材
     *
     * @param url  请求地址
     * @param file 请求临时文件
     * @return JSONObject(通过JSONObject.get ( key)的方式获取media_id)
     * <p>
     * JSONObject信息:
     * 媒体文件类型，分别有图片（image）、语音（voice）、视频（video），普通文件(file)
     * {"errcode": 0,
     * "errmsg": ""，
     * "type": "image",
     * "media_id": "1G6nrLmr5EC3MMb_-zK1dDdzmd0p7cNliYu9V5w7o8K0",
     * "created_at": "1380000000"}
     */
    public static String send(String url, File file) throws IOException {
        String result = null;
        URL urlObj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) urlObj.openConnection();
        con.setRequestMethod("POST"); // 设置关键值,以Post方式提交表单，默认get方式
        con.setDoInput(true);
        con.setDoOutput(true);
        con.setUseCaches(false); // post方式不能使用缓存
        // 设置请求头信息
        con.setRequestProperty("Connection", "Keep-Alive");
        con.setRequestProperty("Charset", "UTF-8");
        // 设置边界
        String BOUNDARY = "----------" + System.currentTimeMillis();
        con.setRequestProperty("Content-Type", "multipart/form-data; boundary="
                + BOUNDARY);
        // 请求正文信息
        // 第一部分：
        StringBuilder sb = new StringBuilder();
        sb.append("--"); // 必须多两道线
        sb.append(BOUNDARY);
        sb.append("\r\n");
        //name必须为media
        sb.append("Content-Disposition: form-data;name=\"media\";filename=\""
                + file.getName() + "\"\r\n");
        sb.append("Content-Type:application/octet-stream\r\n\r\n");
        byte[] head = sb.toString().getBytes("utf-8");
        // 获得输出流
        OutputStream out = new DataOutputStream(con.getOutputStream());
        // 输出表头
        out.write(head);
        // 文件正文部分
        // 把文件已流文件的方式 推入到url中
        DataInputStream in = new DataInputStream(new FileInputStream(file));
        int bytes = 0;
        byte[] bufferOut = new byte[1024];
        while ((bytes = in.read(bufferOut)) != -1) {
            out.write(bufferOut, 0, bytes);
        }
        in.close();
        // 结尾部分
        byte[] foot = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("utf-8");// 定义最后数据分隔线
        out.write(foot);
        out.flush();
        out.close();
        StringBuffer buffer = new StringBuffer();
        BufferedReader reader = null;
        try {
            // 定义BufferedReader输入流来读取URL的响应
            reader = new BufferedReader(new InputStreamReader(
                    con.getInputStream()));
            String line = null;
            while ((line = reader.readLine()) != null) {
                buffer.append(line);
            }
            if (result == null) {
                result = buffer.toString();
            }
        } catch (IOException e) {
            System.out.println("发送POST请求出现异常！" + e);
            e.printStackTrace();
            throw new IOException("数据读取异常");
        } finally {
            if (reader != null) {
                reader.close();
            }
        }
        return result;
    }
}
